C++FILT(1)                  GNU Development Tools                 C++FILT(1)

NAME         top

       c++filt - Demangle C++ and Java symbols.

SYNOPSIS         top

       c++filt [-_|--strip-underscore]
               [-s format|--format=format]
               [--help]  [--version]  [symbol...]

DESCRIPTION         top

       The C++ and Java languages provide function overloading, which means
       that you can write many functions with the same name, providing that
       each function takes parameters of different types.  In order to be
       able to distinguish these similarly named functions C++ and Java
       encode them into a low-level assembler name which uniquely identifies
       each different version.  This process is known as mangling. The
       c++filt [1] program does the inverse mapping: it decodes (demangles)
       low-level names into user-level names so that they can be read.

       Every alphanumeric word (consisting of letters, digits, underscores,
       dollars, or periods) seen in the input is a potential mangled name.
       If the name decodes into a C++ name, the C++ name replaces the low-
       level name in the output, otherwise the original word is output.  In
       this way you can pass an entire assembler source file, containing
       mangled names, through c++filt and see the same source file
       containing demangled names.

       You can also use c++filt to decipher individual symbols by passing
       them on the command line:

               c++filt <symbol>

       If no symbol arguments are given, c++filt reads symbol names from the
       standard input instead.  All the results are printed on the standard
       output.  The difference between reading names from the command line
       versus reading names from the standard input is that command line
       arguments are expected to be just mangled names and no checking is
       performed to separate them from surrounding text.  Thus for example:

               c++filt -n _Z1fv

       will work and demangle the name to "f()" whereas:

               c++filt -n _Z1fv,

       will not work.  (Note the extra comma at the end of the mangled name
       which makes it invalid).  This command however will work:

               echo _Z1fv, | c++filt -n

       and will display "f(),", i.e., the demangled name followed by a
       trailing comma.  This behaviour is because when the names are read
       from the standard input it is expected that they might be part of an
       assembler source file where there might be extra, extraneous
       characters trailing after a mangled name.  For example:

                   .type   _Z1fv, @function

OPTIONS         top

           On some systems, both the C and C++ compilers put an underscore
           in front of every name.  For example, the C name "foo" gets the
           low-level name "_foo".  This option removes the initial
           underscore.  Whether c++filt removes the underscore by default is
           target dependent.

           Do not remove the initial underscore.

           When demangling the name of a function, do not display the types
           of the function's parameters.

           Attempt to demangle types as well as function names.  This is
           disabled by default since mangled types are normally only used
           internally in the compiler, and they can be confused with non-
           mangled names.  For example, a function called "a" treated as a
           mangled type name would be demangled to "signed char".

           Do not include implementation details (if any) in the demangled

       -s format
           c++filt can decode various methods of mangling, used by different
           compilers.  The argument to this option selects which method it

               Automatic selection based on executable (the default method)

               the one used by the GNU C++ compiler (g++)

               the one used by the Lucid compiler (lcc)

               the one specified by the C++ Annotated Reference Manual

               the one used by the HP compiler (aCC)

               the one used by the EDG compiler

               the one used by the GNU C++ compiler (g++) with the V3 ABI.

               the one used by the GNU Java compiler (gcj)

               the one used by the GNU Ada compiler (GNAT).

           Print a summary of the options to c++filt and exit.

           Print the version number of c++filt and exit.

           Read command-line options from file.  The options read are
           inserted in place of the original @file option.  If file does not
           exist, or cannot be read, then the option will be treated
           literally, and not removed.

           Options in file are separated by whitespace.  A whitespace
           character may be included in an option by surrounding the entire
           option in either single or double quotes.  Any character
           (including a backslash) may be included by prefixing the
           character to be included with a backslash.  The file may itself
           contain additional @file options; any such options will be
           processed recursively.

FOOTNOTES         top

       1.  MS-DOS does not allow "+" characters in file names, so on MS-DOS
           this program is named CXXFILT.

SEE ALSO         top

       the Info entries for binutils.

COPYRIGHT         top

       Copyright (c) 1991-2017 Free Software Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.3 or
       any later version published by the Free Software Foundation; with no
       Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
       Texts.  A copy of the license is included in the section entitled
       "GNU Free Documentation License".

COLOPHON         top

       This page is part of the binutils (a collection of tools for working
       with executable binaries) project.  Information about the project can
       be found at ⟨⟩.  If you have a
       bug report for this manual page, see 
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository 
       ⟨git://⟩ on 2017-03-13.  If you
       discover any rendering problems in this HTML version of the page, or
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       or you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

binutils-2.28.51                 2017-03-12                       C++FILT(1)